On the stability of Jeffcott rotor in fluid-film bearings
Abstract
For some combinations of rotor speed and radial load, the pressure field of bearing fluid can perturb the pure rotational motion and disturb the normal operation of a rotating machine. Classical approach to the stability analysis of Jeffcott rotor in fluid-film bearings is modelling bearings as spring-damper elements and disregarding the external rotor damping [1, 5]. Nonlinear models are used to verify results obtained from a linearized model. This paper deals with the influence of external rotor damping on the size of stability regions. Stability analysis of the Jeffcott rotor in fluid-film bearings is performed by using both the linear model based on the linearization of bearing force around the static equilibrium position and the nonlinear model of the velocity linearization [2, 3].
Keywords
References
[l] D. Childs. Thrbomachinery Rotordynamics. John Wiley, New York. Singapore, 1993.[2] S.H. Crandall. The instability mechanism responsible for oil whirl and oil whip. In: - ed., Proceedings of Greek National Congress on Mechanics, 659- 672. Democritus University of Thrace, Xanthi, 1995.
[3] S.H. Crandall. Velocity linearisation of the dynamic response of fluid-film bearings. In: L. Pust, ed., Proceedings of European Nonlinear Oscillation Conference, 119- 124. Institute of Thermomechanics, Prague, 1996.
[4] G. Genta. Vibration of Structures and Machines. Springer, New York. .. Tokyo, 1999.
[5] E. Krämer. Dynamics of Rotors and Foundations. Springer-Verlag, Berlin .. . Budapest, 1993.
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